The foundation for biological evolution or descent through modification is

 A)  changes in gene frequency in a population occur from one generation to the next.

The foundation of biological evolution is changes in gene frequency in a population occur from one generation to the next. Mutation, migration, genetic drift, and natural selection along with sexual reproduction result in genetic variation or changes in gene frequency.

~Gotten from USATestprep~

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation:

i don't know, but does anyone wanna be friends? i'm doing my homework at 1: 49 in the morning : /